Machine for making corrugated paperboard



Feb. 28, 1950 w.- s. CONNER 2,499,267.

MACHINE FOR MAKING CORRUGATED PAPERBOARD Filed Sept. 11, 1945 7 a a ;f y

m ffw g g Patented Feb. 28, 1950 MACHINE FOR MAKING CORRUGATED PAPERBOABD William S. Conner, Atlanta, Ga.

Application September 11, 1945, Serial N0. 615,570

Claims. 1

' This invention relates to machines for making corrugated paper board.

The general object of the invention is to provide a machine of this class which has the capacity to produce a corrugated paper board of superior strength and appearance, the bond between the corrugated strip and the liner strip being stronger than the bond heretofore obtained as a result of the operation of machines now and heretofore known and used in the industry.

The most commonly used corrugated paper board making machine includes cooperating corrugating rolls between which a paper strip or web is passed. In order to insure that the paper strip, after having gone through the corrugating pass, is removed from one corrugating roll and directed and guided on to the second corrugated roll. the first roll has been provided with a series of circumferential grooves and stationary fingers, known as stripping fingers, have been located in these grooves. The freshly corrugated strip engages the curved edges of the stripping fingers, which act as guides, and deflect the corrugated strip into the path of movement selected. It is undesirable to groove either corrugating roll inasmuch as the corrugating surface thereof is interrupted by each such groove. Likewise. the stripper fingers are quickly worn away due to the constant friction of the corrugated paper against their guiding edges, and require replacement in from periods varying from two to six weeks. In accordance with the present invention this use of such mechanical fingers is wholly avoided, jets of fluid being directed into the corrugating pass and against thefreshly corrugated paper issuing therefrom, such fiuid jets being so directed as to strip the corrugated paper from one roll and corrugating roll and wraps around that roll to increase the thickness of paper thereon before the machine can be stopped, the guide may recede against the action of the yielding means so as to eliminate the possibility of breakage of the machine due to jamming. A further feature of the invention resides in the design and arrangement of the means for applying paste for the purpose of causing adherence of the corrugated and liner strips of the board. The paste is applied to the liner in parallel bands just prior to the time when the liner and corrugated strips are brought into contact, by a novel paste applying means which very effectively applies the paste to the proper areas of the liner strip. Each paste band is continuous from edge to edge of the liner strip and in the resulting board there is continuous adherence between the crown of each corrugation of the corrugated strip and the fiat surface of the liner strip.

The invention is subject to some modification without loss of advantage and that form which is illustrated in the accompanying drawings is set forth by way of example only. 4

In the drawings:

Figure 1 is a transverse section through the active roller elements of the corrugating macause it to press against and follow the second.

There is no mechanical friction between the paper and any stationary stripping device and, therefore, no wear of any part which performs the function of stripping. The means for directing the jet of fluid, generally gas such as air or steam, into the pass between the corrugating rolls is preferably associated with a cylindrically curved guide member, and the jet device and member together comprise a stripper and guide for insuring the close association of the freshly corrugated strip with the second of the corrugating rolls from the corrugating pass to a second pass in which a liner strip is applied to the previously corrugated strip to form the ultimate product, the corrugated paper board. This guide means is resiliently mounted so that, if by any chine, the frame and other conventional parts being omitted for the sake of clarity of illustration;

Figure 2 is a transverse section, on a somewhat larger scale, through portions of the cooperating corrugating rolls which have just actively performed the corrugating operation, showing the means for directing into the corrugating pass a jet of fluid for the purpose of performing stripping functions;

Figure 3 is an illustration, on a comparatively large scale, of one of the active elements of the paste applying roller, illustrating the means by which a transverse paste band is applied to the liner; and

Figure 4 is a somewhat similar view showing the cooperative relationship-between the paste applying roller and the fountain roll of the paste supply means.

The various rolls shown in section in the drawings are, of course, elongated,being coextensive corrugating roll and the second corrugating roll chance the corrugated strip clings to the second so is indicated at ii. The liner applying roll is indicated at it. The roll for applying paste to the liner is indicated at it, a backing roll at It, a fountain roll at It, and a squeegee roll at H. The fountain roll is partially immersed in a bath of adhesive A contained in the tank or pan IS.

The strip of paper to be corrugated is indicated at S and moves in the direction in which the arrow B is pointed. The liner is indicated at L and moves in the direction in which the arrow L points. The several rolls rotate about their horizontal axes in the directionsindicated by the various arrows which have been placed, for this purpose. The strip 8 first passes around the first corrugating roll l0, then between the corrugating rolls I and I2 where the strip is corrugated in the usual manner by the coaction of the corrugations upon the two rolls. The freshly corrugated strip then moves around the roll [2 to the pass between roll I2 and the liner applying roll it. In the pass between rolls l2 and it the liner L is brought into contact with the corrugated strip S and the two strips are caused to adhere, the completed corrugated board being shown issuing from the pass between -rolls l2 and I8 and moving diagonally upwardly in the direction indicated by the arrow R.

The member 20, which is shown in section, has a cylindrical guide surface 2|, this surface having substantially the same radius as that of the second corrugating roll l2 and the member is supported in such manner that the surface 2| is spaced a slight distance only from the ends of the ribs or corrugating elements l2a of roll l2. This support comprises an elongated bracket 22 mounted upon bolts 22, of which there may be a number disposed in parallel spaced relation, the bracket 22 having cylindrical apertures, one of which is indicated at 22a, for the reception of bolts 23 and the bracket and supporting bolts being relatively slidable. Each bolt 23 is mounted upon a stationary bar or other stationary portion of the machine, indicated at 24. A coiled compression spring is associated with each bolt, being indicated at 25, and being positioned intermediate the bracket 22 and the frame part 24, it being the function of such spring to yieldingly oppose movement of the bracket 22 and guide member 20 away from the roll l2. A second spring 26, having a similar function, is positioned in each recess 22a intermediate the end of each bolt 23 and member 20.

Extending longitudinally of the member 20, and preferably integral therewith is an enlargement 30, the hollow interior 30a of which may be considered to be a conduit comprising a source of supply of fluidnnder pressure, this conduit in turn being connected to a primary source such as an air compressor, steam boiler, or the like. Extending horizontally from this relatively large conduit 20a are a plurality of ducts 3| formed in a forwardly tapering portion of guide 20 which projects well into the pass between the corrugating rolls l0 and I2. There may be a plurality of these parallel ducts 3 I closely spaced, or the duct 3f may be in the nature of a continuous slot extending from end to end of guide 20 so as to discharge an elongated jet horizontally into the pass between the corrugating rolls. This Jet is so directed that it strikes that face of the freshly corrugated strip which has previously been in contact with the corrugated surface of the first corrugating roll l0 and serves to strip the paper from the corrugated surface of the first corrugating roll in a continuous manner as therolls revolve, causing the strip to remain in corrugated moving paper strip and any stationary stripping device or series of fingers such as heretofore universally employed in the art. The continuously moving corrugated strip remains in close association with the corrugated surface of the roll l2, the cylindrical guide surface 2| of the guide 20 being eifective to prevent movement of the strip away from the roll l2. As the corrugated strip passes through the pass between the corrugating roll l2 and liner applying roll it it is brought into contact with the liner L to which paste has previously been applied in transverse bands and at this point the adhesion of the corrugated and the non-corrugated portions of the ultimate product is caused to occur.

It will be observed upon an inspection of Figures 1, 3 and 4 that the paste roll it is longitudinally ribbed or fluted, these ribs Ma, one of which is illustrated on a relatively large scale in Figure 3, having generally flat outer end surfaces each of which is inclined to a radius passing therethrough. The teeth are preferably formed as integral portions of a plastic, rubber or metal roll cover llb. The backing roll l5 may likewise be formed of plastic, rubber or metal. when the ribs of the paste roll are of metal the backing roll will be yieldable and when the backing roll is of metal the roll cover Nb and its integral ribs will be fabricated of yieldable material. The fountain roll l6 picks up on its surface a quantity of adhesive and a portion passes the squeegee roll I! and remains as a film on the roll surface. The peripheral speed of roll it is slightly greater than the peripheral speed of the paste roll H so that there is a wiping action by means of which a quantity of adhesive is transferred to the outer end surface of each rib Ila as that rib passes the fountain roll. This adhesive is carried around and applied to the undersurface of the strip L and the peripheral speed of the paste roll it isv the same as the peripheral speed of the corrugating roll l2. Likewise the rolls are so timed with relation to each other that the crown or outer end of each corrugation of the corrugated strip passing between corrugating roll I: and the liner applying roll I! makes exact contact with one of the spaced bands of adhesive previously placed upon the corresponding surface of strip L by the paste applying mechanism. The bond between each corrugation and the liner is firm and continuous from one end of such corrugation to the other and there are no places along the length of any corrugation where the bond is less firm than it is elsewhere, a defect in board formation commonly found in the product of machines of the type now in use and in which at least the first of the pair of corrugated rolls is c'ircumferentially grooved to permit the use of the conventional me,- chanical stripper fingers.

It will be appreciated that, where one of the corrugating rolls such as roll It illustrated in the drawing is circumferentially grooved, that that portion of the strip to be corrugated which bridges such groove will not be engaged upon both sides by the rolls and that the corrugating action over the grooved area will not be perfect. In accordance with the present invention, however, both corrugating rolls have continuous corrugating ribs extending from end to end and each corrugation is uniform in section from end to roll the freshly corrugated strip issuing from the roll pass, said means comprising a device for directing a jet of fluid under pressure toward the roll pass and against one side of the corrugated D 961.

2. In a machine for making corrugated board, in combination, cooperating corrugating rollers and means for continuously stripp n from the surface of one roll and directing onto the other roll the freshly corrugated strip issuing from the roll pass, said means comprising a device having a duct extending toward the roll pass and terminating in a port immediately adiacent such pass, for directing a Jet of fluid under pressure against one side of the corrugated paper.

3. In a mac e for making corrugated board, in combinatio cooperating corrugating rollers and means for continuously stripping from the surface of one roll and directing onto the other roll the freshly corrugated strip issuing from the roll pass, said means-comprising a device having a duct so disposed that a jet of fluid discharged therefrom will be projected directly toward the roll pass and in a direction substantially tangen- 6 tial to both rolls so as to impinge against the corrugated surface of one roll and against that face of the corrugated paper which has previously been in contact with that roll. 1

4. In a machine for making corrugated board,

in combination, corrugating rolls, means for delivering fluid under pressure to separate freshly corrugated paper from one roll and press it against the second, and a guide having a cylindrical surface disposed concentrically with respect to the second roll for maintaining the strip thus separated in close contact with the second roll during a predetermined arc of travel.

5. The combination set forth in claim 4 in which the said means and guide are formed as one integral structure.

WILLIAM B. CONNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS" 

